MODELING HETEROGENEITY IN PRODUCTION MODELS: EMPIRICAL EVIDENCE FROM INDIVIDUAL FARMING IN POLAND

This discussion paper deals with the estimation of a random coefficient model. The virtue of
this approach is that it considers firm heterogeneity, which conventional SFA models do not.
Applying the model to Polish farms, the results indicate that the conventional random and
fixed effect models overestimate the inefficiency score. In addition, the reasons for inefficiency
are analyzed. It is shown that despite the fragmentation of Polish agriculture, there is
no evidence for scale inefficiency. Moreover, inefficiency could partly be attributed to factors,
which affect the management input and requirements on farms.